US3985448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angle or length measuring device
Assignee: Geotronics AB
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Filing: 1975-01-08
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Granted: 1976-10-12
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Expires: 1995-01-08
Abstract
Abstract A measuring device is disclosed which can measure an angle or length and which employs either an angle or length measuring plate. The angle or length measuring plate has thereon at least one measuring scale which has a regular pattern along the majority of the lengths thereof and an irregular pattern on two portions thereof. A light beam shines through an optical system to pass through the measuring scale at two points and from there into a photo-detector. The light path is arranged to pass through the two irregular portions at the same time. Several embodiments of the irregular patterns are shown. A circuit is also shown to detect the irregular portions and employ it as a reference signal.
Inventors
- 👤 Klas Rudolf Wiklund
- 👤 Nils Gunnar Bernhard
- 👤 Harald Kleinhuber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:24
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A measuring device including: a measuring plate mounted for movement past a point having a measuring scale thereon, said scale being comprised of a regular optical pattern and a first irregular optical pattern; a photo-detector mounted at said point for detecting light from said measuring scale to provide an electric signal; first means responsive to said electric signal for providing a reference signal in response to said electric signal resulting from said first irregular optical pattern; and second means responsive to said electric signal for providing a measuring signal in response to said electric signal resulting from said regular optical pattern.
Claim 2
Dependent Claim
101 words
A measuring device including: a measuring plate mounted for movement past a point having a measuring scale thereon, said scale being comprised of a regular optical pattern and a first irregular optical pattern; a photo-detector mounted at said point for detecting light from said measuring scale to provide an electric signal; first means responsive to said electric signal for providing a reference signal in response to said electric signal resulting from said first irregular optical pattern; and second means responsive to said electric signal for providing a measuring signal in response to said electric signal resulting from said regular optical pattern.
Claim 3
Dependent Claim
23 words
The measuring device as defined in claim 1 in which the irregular pattern is comprised of said regular pattern with additional fields inserted.
Claim 4
Dependent Claim
22 words
The measuring device as defined in claim 1 in which the irregular pattern is comprised of said regular pattern with fields removed.
Claim 5
Dependent Claim
49 words
The measuring device as defined in claim 1 in which said measuring scale has a second irregular optical pattern thereon and light detected by said photo-detector passes through said measuring scale at two points which includes said second irregular optical pattern when it includes said first irregular optical pattern.
Claim 6
Dependent Claim
20 words
A measuring device as defined in claim 4 in which said first and second irregular optical patterns are the same.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |